Mann-Whitney U Test Calculator
Compare two independent samples with ranks, exact or asymptotic p-values, and effect sizes.
Mann-Whitney U
Enter samples
Auto chooses exact when ties allow.
| Metric | Value |
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| Value | Group | Rank |
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U1 = R1 - n1(n1 + 1) / 2
How?
How this is calculated
The calculator ranks all observations together, assigns average ranks to ties, and computes U for group 1. Exact mode uses the no-tie U distribution. Asymptotic mode uses the normal approximation with tie correction and a continuity correction.
Formula: U1 = R1 - n1(n1 + 1) / 2
Sources
- SciPy mannwhitneyu. SciPy. Retrieved .
- Mann and Whitney 1947 paper. Project Euclid. Retrieved .
Method last reviewed